Mahmoud

QUOTE (Tim_S @ May 21 2008, 11:20 PM)

What kind of task are you trying to perform? Based some assumptions of your rates (20 RPS and 360 ppr), you're not going to be able to respond to many things with Windows. There are alternative methods of DAQ if you're trying to make measurements with post-DAQ-analysis. Throw out your Windows routines and get something that is FPGA based (cRIO or the RIO boards work well) if you're trying to control engine components.

Tim

Tasks may be simplified to be invoking injector & ignition circuit via digital signals once per revolution upon specific degrees

the card used is http://sine.ni.com/nips/cds/view/p/lang/en/nid/14122' target="_blank">ni 6250

hi

i'm talking of about 20 RPS on each revolution 360 pulse means about 7200 pulse per second

by searching i found a solution hope to be suitable in my situation

QUOTE

I would recommend using the encoder input as your sample clock for the AI.

any information of how to do this ?

Hi all ,,

Im new to lab view , i'm currently using it for my graduation project (controlling gasoline engine using lab view) , my problem now is to utilize an encoder to perform specified tasks upon certian degrees , so i used loop that get the current degree from the encoder then perform the tasks upon specified conditions, the problem that the encoder frequency is higher than loop iteration frequency (i think that) for examlple i did an equality comparison with certain degree number then i found for low RPM it invoke the associated equality task but for heigher RPM it doesnt.

so i thaught if the loop iteration frequency can be raised ?

or can i make my tasks pulse driven ? i meant perform the tasks upon each pulse come from the encoder (instead of using loop)

Thanks